You can try this - tag your fragments with some name and store this in any static helper class using getter/setter method. Make your first fragment tag name as default (this is for first time launch). Then at place where you have logic to add new fragments, put the required if-else statements. Same goes for other tab also. (you can even use shared preferences, if you want to remember last seen fragment even when app is closed and restarted again.)
Create a static helper class.
public class HelperClass {
private static string TabOneFragmentOnScreen = "";
public static String getTabOneFragmentOnScreen () {
return TabOneFragmentOnScreen ;
}
public static void setTabOneFragmentOnScreen(
String TabOneFragmentOnScreen) {
HelperClass.TabOneFragmentOnScreen = TabOneFragmentOnScreen;
}
}
When you click one TabOne
if(HelperClass.getTabOneFragmentOnScreen.equals("")){
HelperClass.setTabOneFragmentOnScreen("FragmentOne");
//logic to add fragment one goes here
}
if(HelperClass.getTabOneFragmentOnScreen.equals("FragmentTwo")){
HelperClass.setTabOneFragmentOnScreen("FragmentTwo");
//logic to add fragment two goes here
}
This way it will always remember the last fragment on screen under tab one.
This code is not complete, but you can develop further on this logic.